题目内容
解比例.
①
=
②0.75:
=12:x ③
:
=x:
④4:4.5=
⑤
:
=x:9 ⑥6.5:x=3.25:4.
①
0.7 |
x |
14 |
5 |
1 |
2 |
2 |
15 |
1 |
6 |
2 |
3 |
④4:4.5=
x |
27 |
2 |
3 |
5 |
6 |
分析:根据比例的基本性质,两内项之积等于两外项之积,把原式改写,然后再根据等式性质进行求解即可.
解答:解:①
=
,
14x=0.7×5,
14x÷14=3.5÷4,
x=0.25;
②0.75:
=12:x,
0.75x=
×12,
0.75x÷0.75=6÷0.75,
x=8;
③
:
=x:
,
x=
×
,
x÷
=
÷
,
x=
;
④4:4.5=
,
4.5×
=4,
x÷
=4÷
,
x=24;
⑤
:
=x:9,
x=
×9,
x÷
=6÷
,
x=
;
⑥6.5:x=3.25:4.
3.25x=6.5×4,
3.25x÷3.25=26÷3.25,
x=8.
0.7 |
x |
14 |
5 |
14x=0.7×5,
14x÷14=3.5÷4,
x=0.25;
②0.75:
1 |
2 |
0.75x=
1 |
2 |
0.75x÷0.75=6÷0.75,
x=8;
③
2 |
15 |
1 |
6 |
2 |
3 |
1 |
6 |
2 |
15 |
2 |
3 |
1 |
6 |
1 |
6 |
4 |
45 |
1 |
6 |
x=
8 |
15 |
④4:4.5=
x |
27 |
4.5×
x |
27 |
1 |
6 |
1 |
6 |
1 |
6 |
x=24;
⑤
2 |
3 |
5 |
6 |
5 |
6 |
2 |
3 |
5 |
6 |
5 |
6 |
5 |
6 |
x=
36 |
5 |
⑥6.5:x=3.25:4.
3.25x=6.5×4,
3.25x÷3.25=26÷3.25,
x=8.
点评:本题主要考查解比例,根据比例的基本性质和等式的性质进行解答即可.
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